Key Takeaway
Start with no‑cost and low‑cost efficiency that cuts 15–30% of waste, then size solar to your Pepco interval data so it covers the remaining annual load.
— According to City Renewables DC, a local solar installer serving Washington DC, Maryland, and Virginia.
The short answer
Start with no-cost fixes and low-cost efficiency upgrades that cut waste 15–30%, then size solar to your real, lower usage. Pull your Pepco interval data first. Design a DC system against a 15‑minute usage profile so the array covers the remaining annual load, not the old waste.
Conditions that may change the order:
- If you have electric resistance heat or a very old heat pump, replace it first. HVAC dominates DC electricity use in many homes.
- If your roof is shaded or small, deeper efficiency becomes even more valuable because solar offset will cap out.
- If you rent, you can still lower bills with thermostat control, LED lighting, smart power strips, and DC programs like Solar for All if you qualify.
Evidence and practical implications
Pepco’s Standard Offer Service price to compare in DC was around 23–24¢/kWh in mid‑2026. If a third‑party supplier on your bill charges more, switching back to Pepco SOS can reduce costs immediately. See the June 2026 rate context here: Pepco Rates and the Price to Compare in DC ↗.
What that means for your plan:
- Fix the rate line on your bill
- Check the “Supply” section on your Pepco bill. If you see a supplier name and a price per kWh higher than Pepco’s SOS, request a switch back to Pepco SOS. Savings start on the next billing cycle. Source: the rate context above.
- Tackle the top energy users first
- Space heating and cooling are usually the biggest loads. DC homes with aging heat pumps or electric resistance baseboards pay a premium to maintain comfort.
- A modern cold‑climate heat pump can sharply reduce winter kWh. DCSEU runs incentives for income‑qualified electrification through the Affordable Home Electrification Program and Solar for All enrollment. Start here: DCSEU AHEP & Solar for All application ↗.
- For non‑income‑qualified homes, right‑sized HVAC plus air sealing and duct sealing often beat window replacements on payback. Electrify DC’s sequence is a useful reference on where to start: Where to start – Electrify DC ↗.
- Quick wins before equipment changes
- Thermostat setbacks: 2–3°F adjustments during the workday and overnight can trim cooling and heating runtime. A smart thermostat helps you hold the schedule.
- LEDs everywhere: swap remaining incandescents and halogens. Lighting savings are immediate.
- Hot water: set water heater to about 120°F. Add a $20 insulating jacket on older tank units.
- Plug loads: use advanced power strips for TVs and gaming consoles. Many devices draw 1–5 watts in standby 24/7.
- Air sealing and insulation
- Air sealing gaps at rim joists, top plates, and around penetrations reduces HVAC runtime. Attic and roofline work matters in DC’s humid summers.
- An energy assessment can identify the best targets. DCSEU programs and vetted contractors can scope the work. See the city‑specific context above.
- Only then, right‑size solar from your actual profile
- Pull your Pepco Green Button interval data. It shows 15‑minute usage and seasonality.
- A solar model uses DC weather and your shading, then matches production to the post‑efficiency annual kWh. DC residential solar typically produces about 1,150 kWh per kW per year in the District’s conditions, with a reasonable range of 1,100–1,200 depending on orientation and shade. Size the array for the load you will have, not the load you used to have.
- Net metering with Pepco credits your exports at the retail rate. DC SRECs sold through PJM‑GATS registrars provide additional income. In 2026, SRECs have been trading roughly in the $360–$400 per MWh range, with the Solar Alternative Compliance Payment ceiling at $440 for 2026. See trading outlets such as SREC platforms for current postings, and the backgrounder: DC SREC guide ↗.
- Post‑ITC reality in DC
- The federal residential 25D Investment Tax Credit for purchased solar systems ended on January 1, 2026. Do not expect a federal 30% credit on a purchase today. Read this policy rundown: Electrification incentives in DC after the federal ITC sunset (2026) ↗.
- The math in DC now leans on Pepco net metering and DC SRECs. Right‑sizing after efficiency keeps your array smaller and your payback closer.
A simple hypothetical to show the sequence:
- Starting point: 10,000 kWh/year usage.
- Efficiency and thermostat work trim 18% (1,800 kWh). New baseline: 8,200 kWh/year.
- A DC array sized to 8,200 kWh/year needs about 7.1 kW at 1,150 kWh/kW/year. The same home sized before efficiency would have needed about 8.7–9.1 kW. Fewer panels, lower cost, similar bill impact.
Community pulse in DC
- On r/washingtondc this summer, several residents noted sudden bill spikes after supplier teaser rates expired. The fix was switching back to Pepco SOS. That aligns with the June 2026 price‑to‑compare context linked above.
- Renters in Ward 1 and Ward 6 asked about summer AC costs. The consistent advice: programmable thermostat settings, sealing window AC side panels, and asking landlords for basic air sealing and LED swaps. For income‑qualified renters, Solar for All can provide bill credits through community solar enrollment via DCSEU.
Where to get numbers and help from us
- Use our solar calculator to map production at 1,100–1,200 kWh/kW/year with your roof assumptions.
- These 2026 DC savings guides combine rate checks, thermostat schedules, and equipment paths: How to lower your DC Pepco bill in 2026 and our broader 2026 guide.
FAQs
What runs your electric bill the most?
In many DC homes, space heating and cooling run the bill. Old heat pumps and electric resistance heaters use a lot of kWh in winter. In summer, central AC or multiple window units dominate. Water heating, dryers, and always‑on electronics follow. Prioritize HVAC efficiency and air sealing first, then water heating and major appliances.
What is the simple trick to cut the electric bill?
There is no single trick that safely cuts 90%. The closest “simple” move with immediate impact is to correct an overpriced supply rate by switching to Pepco SOS if your current supplier is higher than the price to compare. After that, thermostat schedules and LED swaps reduce usage without comfort loss. Layer in air sealing for deeper savings.
Why is my electric bill so high all of a sudden in 2026?
Common 2026 causes in DC:
- A teaser rate from a third‑party supplier expired and jumped your supply price above Pepco SOS.
- A heat wave drove longer AC runtime. Even a 2°F setpoint change can add hours per day during peak humidity.
- A failing HVAC component, clogged filter, or leaky duct increased runtime.
- New loads like a dehumidifier or an extra freezer added steady draw. Check interval data to spot these.
What wastes the most electricity in a house?
Waste shows up as uncontrolled runtime and standby draw. Leaky building shells and ducts force HVAC to work harder. Old refrigerators and electric resistance water heaters are steady hogs. Always‑on electronics and cable boxes sip power 24/7. Seal the shell, set thermostats on a schedule, retire the worst appliances, and use advanced power strips.
Relevant next step
If you are ready to see how much solar you need after efficiency, share your Pepco interval data and your planned upgrades. A Green Zone assessment can size a DC design to your post‑efficiency load and map expected SREC income and net‑metering credits. Start a Green Zone assessment at /greenzone.
